Can anyone help me with the formula or calculations to find the "retirement need to cover yearly withdrawals" and "retirement need to cover charitable donations"?? I think im doing this all wrong?

1 CHAPTER 3, ACTIVITY 3: RETIREMENT CALCULATOR 3 INPUTS: 4 Current Age 5 Retirement Age 6 Amount Saved So Far 7 Current Income 8 Income Growth Rate 9 Savings Rate 10 APR 11 MAX INCOME PRE-RETIREMENT 12 FV OF SAVINGS $2,000 $58,000 3.80% 20.00% 7.00% $288,346.17 $4,884,353.71 60% $173,007.70 2.30% 4.00% 14 RETIREMENT: 15 % of max income required 16 Amount Needed in First Year of Retirement 17 Annual Growth Rate 18 Retirement APR 19 Retirement Years 20 PLANNED LEGACY DONATION 21 RETIREMENT NEED TO COVER YEARLY WITHDRAWALS 22 RETIREMENT NEED TO COVER CHARITABLE DONATION TOTAL RETIREMENT NEED $500,000 $64,898.10 $64,898.10 $3,574,175.01 28 WILL YOU REACH GOAL